Key result
Porcine heterografts were associated with a similar platelet half-life (2.9 ± 0.6 days) compared to mechanical prosthetic valves (3.2 ± 0.6 days, p>0.05), both lower than normal subjects.
Why the study?
Does porcine heterograft valve replacement compared to mechanical prosthetic valve replacement result in different platelet half-life?
Observational (n=16)
Does porcine heterograft valve replacement compared to mechanical prosthetic valve replacement result in different platelet half-life?
Decreased platelet survival is common and equal in both porcine and mechanical valves, indicating that platelet half-life reflects prosthetic-induced physical trauma rather than predicting thromboembolic risk.
Answers are grounded in this paper and cite their sources.
Similar platelet survival with both valve types suggests prosthetic trauma as driver; leaves open its role in predicting thromboembolic risk.
Because thromboembolic pathogenesis in mechanical prosthetic valves (MP) might involve selective MP platelet consumption with consequent reduced platelet survival, it has been suggested that lowered platelet half-life (T 1/2) detection provides identification of postoperative thrombotic risk. Porcine heterografts (PH) possess less thromboembolic hazards than MP; thus, comparative evaluation of PH versus MP platelet T 1/2 is germane to the test's thrombotic predictive value, yet platelet kinetics in PH require elucidation. Accordingly, 51chromium platelet T 1/2 was determined in 16 patients with substituted valves (10 PH and 6 MP). Average platelet T 1/2 in PH (2.9 +/- 0.6 d) was similar (p greater than 0.05) to MP (3.2 +/- 0.6 d), and both were considerably lower (p less than 0.05) than platelet T 1/2 in normal subjects (NL, 5.1 +/- 0.5 d). Furthermore, platelet T 1/2 was below the lowest NL platelet T 1/2 (4.0 d) in seven PH and three MP patients. Thus, frequency and extent of decreased platelet survival in PH are common and equal to MP. These results indicate that platelet half-life does not afford thromboembolic predictability in patients with mechanical valves and, instead, favors prosthetic-induced physical trauma causing abnormal platelet survival.
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Lee et al. (1981) conducted an observational in Substituted heart valves (n=16). Porcine heterografts (PH) vs. Mechanical prosthetic valves (MP) and normal subjects was evaluated on 51chromium platelet half-life (T 1/2) in days (p=>0.05). Porcine heterografts were associated with a similar platelet half-life (2.9 ± 0.6 days) compared to mechanical prosthetic valves (3.2 ± 0.6 days, p>0.05), both lower than normal subjects.
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